A control is used to establish a baseline in an experiment.
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Answer: <u>B. They signal phagocytes
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Explanation: Complement proteins are a part of immune system of the body. These are plasma proteins which help in the process of marking and killing the pathogens. These are not involved in the fever causing mechanism, so option D is incorrect. Also, these are not carrier proteins, and are not associated with hormones, thus option C is also incorrect. Since these proteins bind with the pathogens and make them easily recognized by the phagocytes, option B is the right answer.
<h2>Short for (adenosine diphosphate) An organic compound that is composed of adenosine and two phosphate groups. With the addition of another phosphate group, it is converted to ATP for the storage of energy during cell metabolism.</h2>
The atoms of Mg (Magnesium) and Cl (Chlorine) will form an ionic bond. Ionic bond is basically formed by the sharing of electrons. Magnesium being a metal has two electrons in its outermost shell which Mg can readily loose to attain stability, chlorine on the other hand has seven electrons in the outermost shell so it can accept one electron to attain stability. So, both Mg Cl can form ionic bond with each other so form a stable compound MgCl2.
